If black hole formation and evaporation can be described by an S matrix,
information would be expected to come out in black hole radiation. An estimate
shows that it may come out initially so slowly, or else be so spread out, that
it would never show up in an analysis perturbative in MPlanck​/M, or in 1/N
for two-dimensional dilatonic black holes with a large number N of minimally
coupled scalar fields.Comment: 12 pages, 1 PostScript figure, LaTeX, Alberta-Thy-24-93 (In response
to Phys. Rev. Lett. referees' comments, the connection between expansions in
inverse mass and in 1/N are spelled out, and a figure is added. An argument
against perturbatively predicting even late-time information is also
provided, as well as various minor changes.